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I've been researching what all is required to install megasquirt, and so far the only real advantage I see over tuning the GM ECM is the ability to easily set up distributorless ignition, using a ford EDIS ignition module. It is not coil-on-plug, but uses coil packs, 4 of them for an 8 cylinder engine. It uses the 'wasted spark' method, which means that 2 plugs fire at once. This method does not need a cam position sensor, only a crank position sensor. I know I could add a crank position sensor without too much trouble, but I'm wondering how hard it would be to make the factory ECM control the EDIS module. It has 2 data wires, one for the ECM tach input, and one for the ECM advance control. The tach signal is a +5V squarewave, and the advance from the ECM is a +12V squarewave. I'm not sure how a GM ECM tells the ignition module to advance timing, is this even close? Most of the EDIS info I have found here: http://www.megamanual.com/ms2/EDIS.htm
If this isn't feasible, are there any aftermarket options for something like this? I found a little bit of info on modifying an optispark setup and using an LT1 ecm, with LS1 coils, but that sounds like more trouble than it's worth.
__________________ North Texas Third Gen Association 1988 GTA 5.0/M5/3.45 LSD, T-Tops, Digital Dash, Leather - Current Ride 1983 Firebird S/E - Stripped 1995 Chevy 1500 5.7 Ext. Cab - Daily Driver
It allows 3 diminsional timing programming and works with the EDIS. You would have to keep the opti in place to simply provide ref to the stock ECM.
You would have full tunability and it would work with the stock ECM.
__________________ 1996 Chevy S10 Standard Cab Shortbed LT1 running Megasquirt and Ford EDIS distributorless Ignition TH350 with full TCI kit and 3,000 stall w/stage 2 shift kit (soon to be a built 4L60E) Full Belltech drop suspension with mini c-notch
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Last edited by Brian Esser; 02-25-2008 at 07:33 AM.
